ios - CCCrypt 因 EXC_BAD_ACCESS 崩溃

Question

我正在加密视频，有时我会遇到 CCCrypt 崩溃。这是我的加密方法，谁能解释它为什么会崩溃？（该过程在队列中的 NSOperation 中运行）。崩溃发生CCCryptorStatus cryptStatus = CCCrypt在线

    char *key = MY_ENCRYPTION_KEY;
    NSUInteger dataLength = [data length];
    uint8_t encryptedData[dataLength + kCCBlockSizeAES128];
    size_t encryptedLength;
    size_t encryptedDataLength = dataLength + kCCBlockSizeAES128;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionECBMode|kCCOptionPKCS7Padding, key, kCCKeySizeAES128, NULL, [data bytes], dataLength, encryptedData, encryptedDataLength, &encryptedLength);

    if(cryptStatus == kCCSuccess)
    {
        NSData *output = [[NSData alloc] initWithBytes:encryptedData length:encryptedLength];

        completionBlock(nil, output);

    } else {
        NSError *error = [[NSError alloc] initWithDomain:@"Error encrypting" code:-999 userInfo:nil];
        completionBlock(error, nil);
    }